Final answer:
It is true that exact dosing of heparin is crucial due to its narrow therapeutic window. Systemic blood pressure must indeed stay above 60 mmHg for proper filtration. If red blood cells burst after an injection, it indicates a hypotonic solution was used in error, not an isotonic one.
Step-by-step explanation:
The statement that because of the action of heparin an exact dosage is crucial and the dosage should not be rounded off is true. Heparin is a medication that prevents blood clots, and because its therapeutic window is narrow, exact dosing is essential to prevent either undercoagulation, which can lead to thrombosis, or overcoagulation, which can cause bleeding.
Systemic blood pressure must stay above 60 to ensure that adequate filtration occurs is true. A systemic blood pressure of at least 60 mmHg is critical to maintain proper perfusion to organs and facilitate the filtration process in organs such as the kidneys.
If a patient's red blood cells burst after being injected with a saline solution, the patient's autopsy suggesting that the saline solution was not truly isotonic is true.